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-rw-r--r--sysdep/unix/krt.c157
1 files changed, 136 insertions, 21 deletions
diff --git a/sysdep/unix/krt.c b/sysdep/unix/krt.c
index 0647346..090c50b 100644
--- a/sysdep/unix/krt.c
+++ b/sysdep/unix/krt.c
@@ -13,19 +13,47 @@
#include "nest/route.h"
#include "nest/protocol.h"
#include "lib/timer.h"
+#include "conf/conf.h"
#include "unix.h"
#include "krt.h"
+/*
+ * The whole kernel synchronization is a bit messy and touches some internals
+ * of the routing table engine, because routing table maintenance is a typical
+ * example of the proverbial compatibility between different Unices and we want
+ * to keep the overhead of our krt business as low as possible and avoid maintaining
+ * a local routing table copy.
+ *
+ * The kernel syncer can work in three different modes (according to system config header):
+ * o Single routing table, single krt protocol. [traditional Unix]
+ * o Many routing tables, separate krt protocols for all of them.
+ * o Many routing tables, but every scan includes all tables, so we start
+ * separate krt protocols which cooperate with each other. [Linux 2.2]
+ * In this case, we keep only a single scan timer.
+ *
+ * The hacky bits:
+ * o We use FIB node flags to keep track of route synchronization status.
+ * o When starting up, we cheat by looking if there is another kernel
+ * krt instance to be initialized later and performing table scan
+ * only once for all the instances.
+ * o We attach temporary rte's to routing tables.
+ *
+ * If you are brave enough, continue now. You cannot say you haven't been warned.
+ */
+
static int krt_uptodate(rte *k, rte *e);
/*
* Global resources
*/
+pool *krt_pool;
+
void
krt_io_init(void)
{
+ krt_pool = rp_new(&root_pool, "Kernel Syncer");
krt_if_io_init();
}
@@ -96,6 +124,12 @@ kif_shutdown(struct proto *P)
if_start_update(); /* Remove all interfaces */
if_end_update();
+ /*
+ * FIXME: Is it really a good idea? It causes routes to be flushed,
+ * but at the same time it avoids sending of these deletions to the kernel,
+ * because krt thinks the kernel itself has already removed the route
+ * when downing the interface. Sad.
+ */
return PS_DOWN;
}
@@ -182,8 +216,6 @@ krt_learn_scan(struct krt_proto *p, rte *e)
}
}
-/* FIXME: Add dump function */
-
static void
krt_learn_prune(struct krt_proto *p)
{
@@ -353,6 +385,12 @@ krt_dump_attrs(rte *e)
* Routes
*/
+#ifdef CONFIG_ALL_TABLES_AT_ONCE
+static timer *krt_scan_timer;
+static int krt_instance_count;
+static list krt_instance_list;
+#endif
+
static void
krt_flush_routes(struct krt_proto *p)
{
@@ -373,8 +411,6 @@ krt_flush_routes(struct krt_proto *p)
FIB_WALK_END;
}
-/* FIXME: Synchronization of multiple routing tables? */
-
static int
krt_uptodate(rte *k, rte *e)
{
@@ -469,7 +505,7 @@ krt_prune(struct krt_proto *p)
struct rtable *t = p->p.table;
struct fib_node *f;
- DBG("Pruning routes...\n");
+ DBG("Pruning routes in table %s...\n", t->name);
FIB_WALK(&t->fib, f)
{
net *n = (net *) f;
@@ -556,17 +592,29 @@ krt_got_route_async(struct krt_proto *p, rte *e, int new)
* Periodic scanning
*/
-static timer *krt_scan_timer;
-
static void
krt_scan(timer *t)
{
- struct krt_proto *p = t->data;
+ struct krt_proto *p;
kif_force_scan();
- DBG("KRT: It's route scan time...\n");
+#ifdef CONFIG_ALL_TABLES_AT_ONCE
+ {
+ void *q;
+ DBG("KRT: It's route scan time...\n");
+ krt_scan_fire(NULL);
+ WALK_LIST(q, krt_instance_list)
+ {
+ p = SKIP_BACK(struct krt_proto, instance_node, q);
+ krt_prune(p);
+ }
+ }
+#else
+ p = t->data;
+ DBG("KRT: It's route scan time for %s...\n", p->p.name);
krt_scan_fire(p);
krt_prune(p);
+#endif
}
/*
@@ -595,41 +643,106 @@ krt_notify(struct proto *P, net *net, rte *new, rte *old, struct ea_list *tmpa)
struct proto_config *cf_krt;
+static void
+krt_preconfig(struct protocol *P, struct config *c)
+{
+ krt_scan_preconfig(c);
+}
+
+static void
+krt_postconfig(struct proto_config *C)
+{
+ struct krt_config *c = (struct krt_config *) C;
+
+#ifdef CONFIG_ALL_TABLES_AT_ONCE
+ struct krt_config *first = (struct krt_config *) cf_krt;
+ if (first->scan_time != c->scan_time)
+ cf_error("All kernel syncers must use the same table scan interval");
+#endif
+
+ if (C->table->krt_attached)
+ cf_error("Kernel syncer (%s) already attached to table %s", C->table->krt_attached->name, C->table->name);
+ C->table->krt_attached = C;
+ krt_scan_postconfig(c);
+}
+
+static timer *
+krt_start_timer(struct krt_proto *p)
+{
+ timer *t;
+
+ t = tm_new(p->krt_pool);
+ t->hook = krt_scan;
+ t->data = p;
+ t->recurrent = KRT_CF->scan_time;
+ tm_start(t, KRT_CF->scan_time);
+ return t;
+}
+
static int
krt_start(struct proto *P)
{
struct krt_proto *p = (struct krt_proto *) P;
+ int first = 1;
+
+#ifdef CONFIG_ALL_TABLES_AT_ONCE
+ if (!krt_instance_count++)
+ init_list(&krt_instance_list);
+ else
+ first = 0;
+ p->krt_pool = krt_pool;
+ add_tail(&krt_instance_list, &p->instance_node);
+#else
+ p->krt_pool = P->pool;
+#endif
#ifdef KRT_ALLOW_LEARN
krt_learn_init(p);
#endif
- krt_scan_start(p);
- krt_set_start(p);
+ krt_scan_start(p, first);
+ krt_set_start(p, first);
/* Start periodic routing table scanning */
- krt_scan_timer = tm_new(P->pool);
- krt_scan_timer->hook = krt_scan;
- krt_scan_timer->data = p;
- krt_scan_timer->recurrent = KRT_CF->scan_time;
- krt_scan(krt_scan_timer);
- tm_start(krt_scan_timer, KRT_CF->scan_time);
+#ifdef CONFIG_ALL_TABLES_AT_ONCE
+ if (first)
+ krt_scan_timer = krt_start_timer(p);
+ p->scan_timer = krt_scan_timer;
+ /* If this is the last instance to be initialized, kick the timer */
+ if (!P->proto->startup_counter)
+ krt_scan(p->scan_timer);
+#else
+ p->scan_timer = krt_start_timer(p);
+ krt_scan(p->scan_timer);
+#endif
return PS_UP;
}
-int
+static int
krt_shutdown(struct proto *P)
{
struct krt_proto *p = (struct krt_proto *) P;
+ int last = 1;
- tm_stop(krt_scan_timer);
+#ifdef CONFIG_ALL_TABLES_AT_ONCE
+ rem_node(&p->instance_node);
+ if (--krt_instance_count)
+ last = 0;
+ else
+#endif
+ tm_stop(p->scan_timer);
if (!KRT_CF->persist)
krt_flush_routes(p);
- krt_set_shutdown(p);
- krt_scan_shutdown(p);
+ krt_set_shutdown(p, last);
+ krt_scan_shutdown(p, last);
+
+#ifdef CONFIG_ALL_TABLES_AT_ONCE
+ if (last)
+ rfree(krt_scan_timer);
+#endif
return PS_DOWN;
}
@@ -646,6 +759,8 @@ krt_init(struct proto_config *c)
struct protocol proto_unix_kernel = {
name: "Kernel",
priority: 80,
+ preconfig: krt_preconfig,
+ postconfig: krt_postconfig,
init: krt_init,
start: krt_start,
shutdown: krt_shutdown,
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 00:20:23 +0100